On the basis of the Eureka Server cluster , using Spring RestTemplate, combined with the Ribbon function for service invocation, the usage is very simple.
1. Create a new module in the main project, eurekaclient, maven dependency,
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>2. The application.yml configuration file,
spring:
application:
name: eurekaclient
server:
port: 8080
shutdown: graceful
eureka:
client:
service-url:
defaultZone: http://peer1:8761/eureka/
3. Define RestTemplate in the startup class, and support Ribbon to enable load balancing through Spring Cloud's @LoadBalanced annotation.
@LoadBalanced
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}4. Develop an interface in the logservice service for the eurekaclient service to call,
@RestController
@RequestMapping("log")
public class LogController {
@GetMapping("logInfo")
public String logInfo(String logInfo) {
System.out.println(logInfo);
return logInfo;
}
}5. Define a Service class in eurekaclient, add it to the container through the @Component annotation, and use restTemplate to call the logservice service.
@Component
public class LogServiceClient {
@Autowired
private RestTemplate restTemplate;
public String logInfo(String logInfo) {
return restTemplate.getForObject("http://logservice/log/logInfo?logInfo="+logInfo, String.class);
}
}Define the interface in eurekaclient, call the logInfo method of the Service class in step 5,
@RestController
@RequestMapping("client")
public class TestController {
@Autowired
private LogServiceClient logServiceClient;
@GetMapping("getClientInfo")
public String getClientInfo() {
String info = "log info";
return logServiceClient.logInfo(info);
}
}6. Enter the interface address defined in eurekaclient in the browser, http://localhost:8080/client/getClientInfo
7. It is also very convenient to test Ribbon load balancing, only need to start multiple instances of logservice